This is LCR0203 LCR-0203 linear optocoupler DIP-4 Purpose: Audio,Power amplifier;Application field: 3C digital Product information: LCR0203 LCR-0203 DIP4 photoresist isolator linear optocoupler special optocoupler for axial sound box Package Included:10Pcs LCR0203 LCR-0203 Linear optocoupler DIP-4(If the number of products received is incorrect, please contact us. we will refund or give you a replacement.) We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution.